BQ76PL455APFCR datasheet(53/125 Pages) TI1

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bq76PL455A

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SLUSCL0A – SEPTEMBER 2016 – REVISED OCTOBER 2016

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Special care should be taken when addressing the Command Register (address 2). When sending command

frames that generate response frames to this register, the length of a response frame is dependent on the

content of the Command Channel Select Register (address 3–6). When addressing multiple devices, the

response from each device may vary in length depending on the configuration of the addressed device.

Additionally, there may be a delay in the expected response(s) depending on the configuration information stored

in the Voltage and Internal Temperature Sampling Period Register (address 62), AUX Sampling Period Register

(address 63-66), and Test Sampling Period Register (address 67-68). All of the aforementioned registers affect

the channel sampling period.

7.5.3.1 Single Device Write with Response Command Frame

Interpretation of the Data field in a Single Device Write with Response frame depends on the target register of

the command.

If the target register is the Command Register (address 2), then the data bytes may contain the command, new

content for the Command Channel Select Register, and new content for the Averaging Register. If the data for

the Command Channel Register and Averaging Register are omitted from the Single Device Write with

Response Command Frame, then the previously configured values in those registers will be used. If the data are

included in the command frame, then these values will be written into the respective registers and used for the

requested sampling.

If the target register is not the Command Register, then the interpretation of the data bytes will be as the number

of bytes being requested from the bq76PL455A minus one, starting at the register address provided in the

The DATA_SIZE field in the Frame Initialization byte should be written with the number of data bytes in the

command frame.

7.5.3.1.1

Single Device Write with Response to Command Register (Address 2)

The value of the DATA_SIZE field in the Frame Initialization byte for this case is typically 001 (1 byte), 101 (5

bytes) or 110 (six bytes). These variations correspond to commands which:

1. Send only the sample command request and expect the bq76PL455A to use the preprogrammed sampling

values in the registers that control sampling.

2. Send the sample command request and the value for the Channel Select Register (address 3–6), but expect

the bq76PL455A to use the preprogrammed value in the Averaging Register (address 7). The data bytes

from the command frame will overwrite the Channel Select Register.

3. Send the sample command request and the values for the Channel Select Register (address 3–6) and

Averaging Register (address 7). The data bytes from the command frame will overwrite the respective

The size of the response frame in response to a command frame of this type is directly related to the number of

channels selected by either the preprogrammed data in the Channel Select Register (address 3–6) or the data

passed to the bq76PL455A in the command frame.

Three examples follow. All three examples target the device at Device Address 00, which is typically the address

of a single device or the address of the lowest device in a stack of devices.

7.5.3.1.1.1

Data Contains Command Only

For the purpose of this example, assume the following start conditions:

1. Content of Channel Select Register before command: 0FFF5500

2. Content of Averaging Register before command: 00

Command Frame Init

000 (binary)

001 (binary)

Device Address

Data (Command)

CRC (MSB)

CRC (LSB)

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